Improve fader automation quality?

Hi all,

I just bought a presonus faderport.
I absolutely love the way it integrates with ardour.
However there is one problem. The motorised fader is rather jittery when the fader is automated.

It’s not a hardware problem, because when I drag the fader with the mouse the physical fader moves smoothly.
I’ve tried adjusting the automation settings under the misc tab, but nothing seems to change the speed of fader playback.
It seems to record at a good frequency, but when it plays it back, both the digital and the physical faders seem to have a pretty low update frequency.
Is there a setting for this? If not, what can I do about it?